﻿/**
 * Copyright (C) 2012-2013 original author and authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Reflection;

namespace NGuice.Inject.Internal
{
    /// <summary>
    /// 重新抛出用户代码异常以便Errors能够目标化正确的异常
    /// </summary>
    internal static class Exceptions
    {
        public static ApplicationException ThrowCleanly(TargetInvocationException exception)
        {
            Exception cause = exception;
            if (cause.InnerException != null)
            {
                cause = cause.InnerException;
            }
            if (cause is ApplicationException)
            {
                throw (ApplicationException)cause;
            }
            else if (cause is Exception)
            {
                throw (Exception)cause;
            }
            else
            {
                throw new UnhandledCheckedUserException(cause);
            }
        }

        /**
         * A marker exception class that we look for in order to unwrap the exception
         * into the user exception, to provide a cleaner stack trace.
         */
        class UnhandledCheckedUserException : ApplicationException
        {
            public UnhandledCheckedUserException(Exception cause)
                : base("exception", cause)
            {
            }
        }
    }
}
